ISL8501IRZ Intersil, ISL8501IRZ Datasheet - Page 16

• Manufacturer Part Number: ISL8501IRZ
• Description: IC CTLR TRPL PWM/DUAL LDO 24-QFN
• Manufacturer: Intersil
• Type: Step-Down (Buck)r

Specifications of ISL8501IRZ

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 3
• Voltage - Output: 0.6 ~ 20 V
• Current - Output: 1A
• Frequency - Switching: 500kHz
• Voltage - Input: 5V, 6 ~ 25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-VQFN
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

optimum transient response. For stable operation, a ceramic
capacitor, with a minimum value of 10µF, is recommended
for both LDO outputs. There is no upper limit to the output
capacitor value. Larger capacitor can reduce noise and
improve load transient response, stability and PSRR. The
output capacitor should be located very close to V
to minimize impact of PC board inductances and the other
end of the capacitor should be returned to a clean analog
ground.
Buck Regulator Output Capacitor Selection
An output capacitor is required to filter the inductor current
and supply the load transient current. The filtering
requirements are a function of the switching frequency and
the ripple current. The load transient requirements are a
function of the slew rate (di/dt) and the magnitude of the
transient load current. These requirements are generally met
with a mix of capacitors and careful layout.
Embedded processor systems are capable of producing
transient load rates above 1A/ns. High frequency capacitors
initially supply the transient and slow the current load rate
seen by the bulk capacitors. The bulk filter capacitor values
are generally determined by the ESR (Effective Series
Resistance) and voltage rating requirements, rather than
actual capacitance requirements.
High frequency decoupling capacitors should be placed as
close to the power pins of the load as physically possible. Be
careful not to add inductance in the circuit board wiring that
could cancel the usefulness of these low inductance
components. Consult with the manufacturer of the load on
specific decoupling requirements.
Use only specialized low-ESR capacitors intended for
switching-regulator applications for the bulk capacitors. The
bulk capacitor’s ESR will determine the output ripple voltage
and the initial voltage drop after a high slew-rate transient. An
aluminum electrolytic capacitor’s ESR value is related to the
case size with lower ESR available in larger case sizes.
However, the Equivalent Series Inductance (ESL) of these
capacitors increases with case size and can reduce the
usefulness of the capacitor to high slew-rate transient loading.
Unfortunately, ESL is not a specified parameter. Work with
your capacitor supplier and measure the capacitor’s
impedance with frequency to select a suitable component. In
most cases, multiple electrolytic capacitors of small case size
perform better than a single large case capacitor.
Output Inductor Selection
The output inductor is selected to meet the output voltage
ripple requirements and minimize the converter’s response
time to the load transient. The inductor value determines the
converter’s ripple current and the ripple voltage is a function
of the ripple current. The ripple voltage and current are
approximated by the following equations:
16
OUT
pins
ISL8501
Increasing the value of inductance reduces the ripple current
and voltage. However, the large inductance values reduce
the converter’s response time to a load transient. The
recommended ΔI is 30% of the maximum output current.
One of the parameters limiting the converter’s response to
a load transient is the time required to change the inductor
current. Given a sufficiently fast control loop design, the
ISL8501 will provide either 0% or 100% duty cycle in
response to a load transient. The response time is the time
required to slew the inductor current from an initial current
value to the transient current level. During this interval the
difference between the inductor current and the transient
current level must be supplied by the output capacitor.
Minimizing the response time can minimize the output
capacitance required.
The response time to a transient is different for the
application of load and the removal of load. The following
equations give the approximate response time interval for
application and removal of a transient load:
where: I
response time to the application of load, and t
response time to the removal of load. The worst case
response time can be either at the application or removal of
load. Be sure to check both of these equations at the
minimum and maximum output levels for the worst case
response time.
Rectifier Selection
Current circulates from ground to the junction of the
MOSFET and the inductor when the high-side switch is off.
As a consequence, the polarity of the switching node is
negative with respect to ground. This voltage is
approximately -0.5V (a Schottky diode drop) during the off
time. The rectifier's rated reverse breakdown voltage must
be at least equal to the maximum input voltage, preferably
with a 20% derating factor. The power dissipation is:
where V
Input Capacitor Selection
Use a mix of input bypass capacitors to control the voltage
overshoot across the MOSFETs. Use small ceramic
capacitors for high frequency decoupling and bulk capacitors
to supply the current needed each time the switching
MOSFET turns on. Place the small ceramic capacitors
physically close to the MOSFET VIN pins (switching
MOSFET drain) and the Schottky diode anode.
P
t
ΔI =
RISE
D
[
W
=
]
V
=
TRAN
IN
D
Fs x L
I
V
OUT
is the voltage of the Schottky diode = 0.5V to 0.7V
- V
L x I
IN
OUT
- V
is the transient load current step, t
TRAN
⋅
V
OUT
D
x
⋅
V
⎛
⎜
⎝
1
V
OUT
IN
–
V
--------------- -
V
OUT
IN
t
FALL
⎞
⎟
⎠
ΔV
OUT
=
L x I
= ΔI x ESR
V
OUT
TRAN
FALL
RISE
is the
July 12, 2007
(EQ. 5)
(EQ. 3)
(EQ. 4)
FN6500.1
is the